fix: switching mintlify openapi back to copy

[pengying]

TL;DR

Replace symlinked OpenAPI file in Mintlify directory with a direct copy and update build scripts to maintain both copies. Mintlify's Github app errored out when trying to deploy using the openapi.yaml symlink.

What changed?

• Removed the symlink from mintlify/openapi.yaml to ../openapi.yaml
• Added a direct copy of the full OpenAPI schema in mintlify/openapi.yaml
• Updated npm scripts in package.json to copy the OpenAPI file to the Mintlify directory after building or linting

[pengying]

• fix: switching mintlify openapi back to copy #182 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.